“It was often improvising, filming with a baby,” the 25-year-old actor said at the Brussels press conference Oct. 25.

He explained, “At one point there had to be all this fake blood on the newborn baby, so we had to apply it to the baby and the child starts to cry in my arms. So we do everything to calm the baby down a bit and then I thought: ‘This really feels like my baby.’ But it was fun to play, totally different from the other films.”

Rob certainly has babies on the mind. Earlier this week he admitted to M6he’s excited to be a father when the time is right. “Definitely, I wanna have kids,” he said.

Do YOU think Rob will make a good dad? Should he have kids with Kristen Stewart?